Added `if` statemnt to check for negative `min_degrees` and `max_degrees`. Negative `max_degrees` raises `ValueError` instead of returning an empty Set. Split double conditions in `if` statements to multiple `if`'s.
Added `if` statemnt to check for negative
`min_degrees` and `max_degrees`.
Negative `max_degrees` raises `ValueError` instead of
returning an empty Set.
Split double conditions in `if` statements to multiple `if`'s.

kaushik94/sympy,kaushik94/sympy,kaushik94/sympy